Fix patch creation process.
Fix patch creation process.

Revision r6834 introduced patch creation process.
Sadly this process was not functional because of
spurious "echo" command.

It was not possible to test this part using trybots
since actual upload only happens on buildbots.

BUG=http://code.google.com/p/nativeclient/issues/detail?id=2324
Review URL: http://codereview.chromium.org/8098019

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@6836 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client,nacl-webkit/native_client,sbc100/native_client